void main(int n) {
  #测试一下
  char i;
  i='h';
  float p;
  p=2.4;
  p=p-1.2;
  printf p;
  println;
  printc i;
  println;
  print n;
  println;
  do{
    n=n-1;
    print n;
  } while(n>0);
  int tmp;
  tmp=3;
  for(tmp=3;tmp>0;tmp=tmp-1){
    print tmp;
  }
  println;
  exit ;
}